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<?php $strselvaluelist = '4|2'; if(!empty($strselvaluelist)){ echo 0; if(strstr(4, $strselvaluelist)){ echo 1; if(!strstr(17, $strselvaluelist)){ $strselvaluelist.='|17'; echo 2; } } } var_dump($strselvaluelist);

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38.09 ms | 402 KiB | 5 Q